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During the Star League era, SLDF troops would form part of the honor guard for the ruling family of the Principality of Regulus. This caused some tension with the local Regulan Hussars troops, but was appreciated by the ruling Cameron-Jones family.[30]

On the 15th of July 3077 it was reported that the Third Free World Guards had arrived on Regulus to pledge their collective loyalty to the Principality of Regulus. This move was met with some skepticism by the press due to the very real concern that the arrival of the Third Guards was an attempt by the Word of Blake to gain an operational presence within the Principality, as seemed likely given that the Third Guards had last been reported to be on Wing fighting on behalf of the Blakists against Devlin Stone's allied coalition forces. However, as stated by GeneralThomas Orfelt, the Principality couldn't turn it's back on fellow countrymen if the Third Guards were genuine in their desire to defect to the Principality.[37]

The destruction of the FWLS Leodegrance in the Regulus system (and the destruction of seven other Free Worlds League WarShips unaccounted for specifically by name in sourcebooks) was confirmed by the BattleTech Developer Øystein Tvedten via the Catalyst Game Labs Ask The Writers Forum: